Perhaps you should try some spelling variations:
thanh dan » thanh san, thanh van, thanh dat
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
sang mai » sang ma, sang tai, lang mai
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
dan cua » dan ca, ban cua, dai cua
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) ky sang mai hoi. ((hieu ve) or (hieu va)) cam xuc va thanh dan cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang mai hoi. ((hieu ve) OR (hieu va)) cam xuc va thanh dan cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky sang mai hoi. ((hieu ve) or (hieu va)) cam xuc va thanh dan cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky sang mai hoi. ((hieu ve) or (hieu va)) cam xuc va thanh dan cua vat*.